Abstract
Advances in photonics, silicon electronics and digital signal processing
(DSP) have converged to enable highly efficient transmission across fiber
optic channels. Single wavelength data rates of 112 Gb/s are sought for wide
deployment based on QPSK transmission, coherent detection, and digital demodulation.
Here we examine continuous phase modulation (CPM) as a means to enhance performance
and reach of coherent optical links. We quantify the robustness of the constant
amplitude CPM format to spectral filtering and nonlinearities in comparison
to QPSK. The challenges of generating and receiving the CPM waveform are considered
and a novel CPM transmitter architecture is proposed.
© 2011 IEEE
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